The STMicroelectronics STNRG011A digital power combination controller for 90 to 300 W supplies features improved overload management that ensures accurate output voltage regulation when overcurrent protection is active.
Integrating a power factor correction controller (PFC), LLC resonant half-bridge controller, 800V initiating circuit and supervisory mechanism, the STNRG011A is used in power adapters, chargers, and television and lighting power supplies.
The multimode PFC controller implements performance-enhancing features including input voltage feedforward, a distortion optimizer, and frequency limiting. The digital supervision engine has an 8-bit core and dedicated peripherals, with digital algorithms stored in internal ROM to ensure reliability and a minimum bill of materials (BoM).
Compared to the existing STNRG011, the STNRG011A with its new overload management algorithm increases the switching frequency when the overcurrent protection is triggered. In addition to maintaining output voltage regulation, this also prevents unwanted shutdown of the power supply.
Other features include on-chip non-volatile memory for storing configuration parameters and calibration data, which saves external components and allows the device to be customized for specific application requirements.
There is also a 2-pin UART port for monitoring and communication, which simplifies testing and allows for real-time supervision and remote management. PFC and half-bridge protection are integrated, as well as an IEC 62368-1 compliant X capacitor discharge circuit that helps minimize standby power.
